(function (baseFontSize, fontscale) {
  var _baseFontSize = baseFontSize || 100;
  var _fontscale = fontscale || 1;
  var win = window;
  var doc = win.document;
  var ua = navigator.userAgent;
  var matches = ua.match(/Android[\S\s]+AppleWebkit\/(\d{3})/i);
  var UCversion = ua.match(/U3\/((\d+|\.){5,})/i);
  var isUCHd = UCversion && parseInt(UCversion[1].split('.').join(''), 10) >= 80;
  var isIos = navigator.appVersion.match(/(iphone|ipad|ipod)/gi);
  var dpr = win.devicePixelRatio || 1;
  if (!isIos && !(matches && matches[1] > 534) && !isUCHd) {
    // 如果非iOS, 非Android4.3以上, 非UC内核, 就不执行高清, dpr设为1;
    dpr = 1;
  }
  var scale = 1 / dpr;
  var metaEl = doc.querySelector('meta[name="viewport"]');
  if (!metaEl) {
    metaEl = doc.createElement('meta');
    metaEl.setAttribute('name', 'viewport');
    doc.head.appendChild(metaEl);
  }
  metaEl.setAttribute('content', 'width=device-width,user-scalable=no,initial-scale=' + scale + ',maximum-scale=' + scale + ',minimum-scale=' + scale);
  doc.documentElement.style.fontSize = _baseFontSize / 2 * dpr * _fontscale + 'px';
})();
if (!window.Intl) {
  document.writeln('<script src="https://as.alipayobjects.com/g/component/intl/1.0.1/??Intl.js,locale-data/jsonp/en.js,locale-data/jsonp/zh.js">' + '<' + '/script>');
}
if(!window.Promise) {
  document.writeln('<script src="https://as.alipayobjects.com/g/component/es6-promise/3.2.2/es6-promise.min.js"'+'>'+'<'+'/'+'script>');
}
